package y24.m3;

import java.util.Scanner;

public class Test1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double r = scanner.nextDouble();
        double pi = Math.PI;
        double C = 2 * r * pi;
        double S = pi * r * r;
        System.out.println("圆的周长=" + C + '\n' + "圆的面积=" + S);

    }
}
